gemmell



T. H. GEMMELL.

LOCK NUT.

APPLICATION FILED OCT- 25- 1917.

1,319,861. Patented Oct. 28,1919.

FIG. ll

UNITED STATES PATENT OFFICE.

THOMAS H. GEMMELL, 0F GUELPH, ONTARIO, CANADA.

LOCK-NUT.

Application filed October 25. 1917.

To all whom it may concern:

Be it known that I, THOMAS HAY GEM- MELL, a subject of His Majesty King George V of Great Britain, and a resident of the city of Guelph, Province of Ontario, Canada, have invented a new and Improved Lock-Nut, of which the following is a specification.

The object of my invention is a lock nut especially adapted for use on small bolts, and that can be locked or unlocked from the top of the nut.

I attain these objects by means of the mechanism shown in the accompanying drawings in which Figure I is a plan or top view of one form of my new or improved lock nut.

Fig. II is an elevation of same from one side of the nut.

Fig. III is a similar elevation from the opposite side of the nut.

Fig. IV is a plan showing a simplified form of a double locking device according to my invention.

Fig. V is a plan of a modification of Fig. 1, arranged so as to double lock the bolt, and Fig. VI is a side elevation of the same.

Similar letters of reference indicate similar parts in all the drawings.

My invention consists in slotting or planing away part of the top of the nut or stamping same so as to leave solid projecting shoulders on opposite sides of the nut, one of which is drilled in a horizontal direction so as to form the hinge or fulcrum of a wire locking key, while the opposite shoulder may form a stop for the lever end of the locking key to rest against. In Fig. I, A is the nut, B the bolt, C and C are the oppositely projecting shoulders while D is the locking key. The key D is preferably formed of spring wire bent near the center at right angles, the shorter arm is then passed through the horizontally drilled hole in the shoulder C, and then further bent at a suitable angle so as to form the locking arm (cl) projecting into or between the threads of the bolt B.

As will readily be seen when the long arm ((Z) of the locking key D is raised to a vertical position the nut A can be turned loosely on the bolt B. When the nut A has been screwed down into position the lever arm (01) is depressed until its extremity rests against the block C.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Serial No. 1.98.509.

A suitable recess (a) Fig. II being formed to hold it in position and the lockmg arm (d) is forcibly driven into or between the threacl of the bolt B thus firmly locking the nut A into a position where it can be tightened up on the bolt but cannot be withdrawn.

Fig. III shows the lever arm (03') in a raised position so as to show the recess (6) in which its extremity rests.

In Fig. IV the locking key has no lever arm (cZ) its place being taken by a duplicate locking arm.

It will readily be seen that this forms a double locking device preventing the nut from being revolved in either direction.

Fig. V shows a locking device similar to that illustrated in Fig. I but the lever arm is curved around the bolt and its extremity turned in so as to form an auxiliary locking device. In this case the shoulder C is cut away so as to allow the end of the lever arm ((1') to pass between it and the bolt, a recess (6) Fig. VI being provided to hold said lever arm in position when depressed, thus forming a double locking device.

I claim:

1. In combination with a: locking nut with projecting shoulders; a spring wire locking key passing loosely through one of the: shoulders in a horizontal direction, one end of said spring wire key being bent at right angles to form an operating lever and the other end being bent at a suitable angle so as to project into and engage with the threads of the bolt when the lever arm is depressed, substantially as hereinbefore described.

2. In combination with a locking nut with one or more projecting shoulders; a locking key preferably of spring wire passing through a horizontally drilled hole in one of the projecting shoulders both ends of said spring wire locking key being bent at a suitable angle so as to forcibly engage between the threads of the bolt when pressed into place, substantially as hereinbefore described.

THOS. H. GEMMELL,

Witnesses:

J. IV. ALDnRsoN, A. L. MOFADGEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). 0. 

